Embryonic and Larval Development of Glass Catfish Kryptopterus vitreolus (Ng and Kottelat, 2013)
Keywords:
glass catfish, Kryptopterus vitreolus (Ng and Kottelat, 2013), embryonic, developmentAbstract
The study on embryonic and larval development of glass catfish, Kryptopterus vitreolus (Ng and Kottelat, 2013) was carried out in Phitsanulok Inland Fisheries Research and Development center during September-October 2018. The study started from fertilization until hatching that used artificial breeding method. Development and external change of fry from the yolk sac stage to the post-larvae stage were studied. It was found that the fertilized eggs of glass catfish were an adhesive egg, the diameter ranged from 0.75-0.85 mm., round shape and bright yellow in color. The embryo after fertilization was summarized as follows: The cleavage period was 2 h. and 20 min. post-fertilization, morula stage took 3 h. and 50 min., blastula took 7 h., then gastrula was 10 h., somite took 15 h. and 5 min., the hatching out took 21 h. and 30 min. at 25.3-26.7°C of water temperature. The newly larvae were 2.5 mm. in length with the large yolk sac. The 6 h. larvae were 2.8 mm. in length, 1 day old larvae were 4.7 mm. in length, 3 days old larvae were 5.7 mm. in length and the yolk absorption was completed, 5 days old larvae were 6.9 mm. in length and 10 days old larvae were 7.8 mm. in length.
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